| Summary: | 碩士 === 國立清華大學 === 物理學系 === 105 === Circuit quantum electrodynamics (C-QED) is referred to a circuit architecture by
using artificial atom coupled to a microwave resonator as a laboratory to explore
various fundamental interactions between light and matter. Here we investigate
the quantum optics effects of a superconducting artificial atom, named transmon,
strongly coupled to coherent microwave via one-dimensional transmission line,
without resorting a cavity to confine the microwave photons. In particular, we deliberately
implement transmon at the end of transmission, an anti-node position
of microwave field. We measure the reflection and phase properties of system with
frequency detuning and power modulation, and extract the transition frequencies
of the atom via reflection measurement. We find that transmon acts as a mirror for
a weak resonant probe-field, but behaves as a saturated atom as strongly probed.
When we apply a strong control tone associated with the first-second state excitation,
we observe clear Autler- Townes splitting. Our results demonstrate a first
step toward using transmon to explore more intriguing quantum-optic phenomena.
More experimental results and analysis will be presented and discussed.
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